公开(公告)号：US20050043830A1

公开(公告)日：2005-02-24

申请号：US10700488

申请日：2003-11-05

申请人： Kiryung Lee ,  Dong Sik Kim ,  Kyung Ae Moon ,  Young Ho Suh

发明人： Kiryung Lee ,  Dong Sik Kim ,  Kyung Ae Moon ,  Young Ho Suh

IPC分类号： G10L21/00 ,  G10L19/00 ,  G10L19/02 ,  G06F17/00 ,  H04L9/00

CPC分类号： G10L19/018 ,  G10L19/032

摘要： Disclosed is an amplitude-scaling resilient audio watermarking apparatus and method. An encoding apparatus includes: a polyphase filterbank for dividing an audio signal into a plurality of subbands; a psychoacoustic module for applying a psychoacoustic model to the audio signal to provide a signal-to-mask ratio; a watermark encoder for evaluating an encoding parameter from the subbands according to the signal-to-mask ratio and embedding the encoding parameter and a watermark into subbands corresponding to the middle frequency; and a synthesis filterbank for synthesizing the subband signals to output a watermarked audio signal. A decoding apparatus includes: a polyphase filterbank for dividing a received audio signal into the predetermined number of subbands; an EM estimator for estimating an scale factor from an encoding parameter contained in the audio signal and a watermarked subband according to an EM algorithm, and generating the quantizer step size Δd of a decoder according to the amplitude-scaling; a watermark decoder for extracting a watermark from a subband corresponding to the middle frequency considering the quantizer step size; and an integrated determiner for integrating outputs of the watermark decoder to determine a watermark.

摘要翻译： 公开了一种幅度缩放弹性音频水印设备和方法。 编码装置包括：多相滤波器组，用于将音频信号分成多个子带; 用于将心理声学模型应用于音频信号以提供信号与掩模比的心理声学模块; 水印编码器，用于根据信号对掩模比率从子带估计编码参数，并将编码参数和水印嵌入到与中频对应的子带中; 以及用于合成子带信号以输出加水印音频信号的合成滤波器组。 解码装置包括：多相滤波器组，用于将接收到的音频信号分成预定数量的子带; EM估计器，用于根据EM算法从包含在音频信号中的编码参数和加水印子带中估计比例因子，以及根据幅度缩放产生解码器的量化器步长Deltad; 水印解码器，用于考虑到量化器步长从与中频相对应的子带中提取水印; 以及用于积分水印解码器的输出以确定水印的集成确定器。